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31 #ifndef WorkerThreadableLoader_h
32 #define WorkerThreadableLoader_h
36 #include "PlatformString.h"
37 #include "ThreadableLoader.h"
38 #include "ThreadableLoaderClient.h"
39 #include "ThreadableLoaderClientWrapper.h"
42 #include <wtf/PassRefPtr.h>
43 #include <wtf/RefCounted.h>
44 #include <wtf/RefPtr.h>
45 #include <wtf/Threading.h>
50 struct ResourceRequest;
52 class WorkerLoaderProxy;
53 struct CrossThreadResourceResponseData;
54 struct CrossThreadResourceRequestData;
56 class WorkerThreadableLoader : public RefCounted<WorkerThreadableLoader>, public ThreadableLoader {
58 static void loadResourceSynchronously(WorkerContext*, const ResourceRequest&, ThreadableLoaderClient&, StoredCredentials, RedirectOriginCheck);
59 static PassRefPtr<WorkerThreadableLoader> create(WorkerContext* workerContext, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, LoadCallbacks callbacksSetting, ContentSniff contentSniff, StoredCredentials storedCredentials, RedirectOriginCheck redirectOriginCheck)
61 return adoptRef(new WorkerThreadableLoader(workerContext, client, taskMode, request, callbacksSetting, contentSniff, storedCredentials, redirectOriginCheck));
64 ~WorkerThreadableLoader();
66 virtual void cancel();
68 bool done() const { return m_workerClientWrapper->done(); }
70 using RefCounted<WorkerThreadableLoader>::ref;
71 using RefCounted<WorkerThreadableLoader>::deref;
74 virtual void refThreadableLoader() { ref(); }
75 virtual void derefThreadableLoader() { deref(); }
78 // Creates a loader on the main thread and bridges communication between
79 // the main thread and the worker context's thread where WorkerThreadableLoader runs.
81 // Regarding the bridge and lifetimes of items used in callbacks, there are a few cases:
83 // all cases. All tasks posted from the worker context's thread are ok because
84 // the last task posted always is "mainThreadDestroy", so MainThreadBridge is
85 // around for all tasks that use it on the mian thread.
87 // case 1. worker.terminate is called.
88 // In this case, no more tasks are posted from the worker object's thread to the worker
89 // context's thread -- WorkerContextProxy implementation enforces this.
91 // case 2. xhr gets aborted and the worker context continues running.
92 // The ThreadableLoaderClientWrapper has the underlying client cleared, so no more calls
93 // go through it. All tasks posted from the worker object's thread to the worker context's
94 // thread do "ThreadableLoaderClientWrapper::ref" (automatically inside of the cross thread copy
95 // done in createCallbackTask), so the ThreadableLoaderClientWrapper instance is there until all
96 // tasks are executed.
97 class MainThreadBridge : ThreadableLoaderClient {
99 // All executed on the worker context's thread.
100 MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, WorkerLoaderProxy&, const String& taskMode, const ResourceRequest&, LoadCallbacks, ContentSniff, StoredCredentials, RedirectOriginCheck);
105 // Executed on the worker context's thread.
106 void clearClientWrapper();
108 // All executed on the main thread.
109 static void mainThreadDestroy(ScriptExecutionContext*, MainThreadBridge*);
112 static void mainThreadCreateLoader(ScriptExecutionContext*, MainThreadBridge*, std::auto_ptr<CrossThreadResourceRequestData>, LoadCallbacks, ContentSniff, StoredCredentials, RedirectOriginCheck);
113 static void mainThreadCancel(ScriptExecutionContext*, MainThreadBridge*);
114 virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent);
115 virtual void didReceiveResponse(const ResourceResponse&);
116 virtual void didReceiveData(const char*, int lengthReceived);
117 virtual void didFinishLoading(unsigned long identifier);
118 virtual void didFail(const ResourceError&);
119 virtual void didFailRedirectCheck();
120 virtual void didReceiveAuthenticationCancellation(const ResourceResponse&);
122 // Only to be used on the main thread.
123 RefPtr<ThreadableLoader> m_mainThreadLoader;
125 // ThreadableLoaderClientWrapper is to be used on the worker context thread.
126 // The ref counting is done on either thread.
127 RefPtr<ThreadSafeShared<ThreadableLoaderClientWrapper> > m_workerClientWrapper;
129 // May be used on either thread.
130 WorkerLoaderProxy& m_loaderProxy;
132 // For use on the main thread.
136 WorkerThreadableLoader(WorkerContext*, ThreadableLoaderClient*, const String& taskMode, const ResourceRequest&, LoadCallbacks, ContentSniff, StoredCredentials, RedirectOriginCheck);
138 RefPtr<WorkerContext> m_workerContext;
139 RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
140 MainThreadBridge& m_bridge;
143 } // namespace WebCore
145 #endif // ENABLE(WORKERS)
147 #endif // WorkerThreadableLoader_h